Hex #557740 or rgb(85,119,64) in RGB space is the tint of olive. It has hue angle of 97.09 degrees, value = 47 and saturation = 46. #557740 can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of red, 3 drops of cyan, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #557740 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557740 to the mixer and play with it.